<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .parent {
            width: 300px;
            height: 100px;
            border: 3px solid black;
            display: flex;
            flex-wrap: wrap;
        }
        .child {
            /* width: 150px;
            flex: 1; */

            /* flex: 0 0 150px; */

            /* width: 150px; */
            /* flex-grow: 0;
            flex-shrink: 1;
            flex-basis: 150px; */

            flex-basis: 150px;
        }
        /* .child:nth-child(2) {
            order: -1;
        } */
    </style>
</head>
<body>
    <ul class="parent">
        <li class="child" style="background-color: aqua;"></li>
        <li class="child" style="background-color: antiquewhite;"></li>
        <li class="child" style="background-color: brown;"></li>
    </ul>
</body>
</html>